//Don't Edit this code
Main(require("fs").readFileSync("/dev/stdin", "utf8"));
var Main = function(input){
	var element = input.split('\n');
	var maxWidth = parseInt(input[0], 10);
	var length = parseInt(input[1], 10);
	var nums = element[2].sort().map(function(element){
		return parseInt(element, 10)
	},this);
	var tasizan = 0;
	for(i =0;i < length; i++){
		tasizan += nums[i];
		if(tasizan > maxWidth){
			break;
		}
	}
	console.log(i);
};